find intersection points and edge points

Question

majed majed 2015-11-9

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/253909-find-intersection-points-and-edge-points

评论： Image Analyst 2019-10-29

detect_start_intersect.jpg

As you see in figure, I have a binary image which has been thinned. It contains English letters, some letters have intersection points (marked with red circles), and some don’t have those.

I want to extract intersection points for every litter and put it in a cell or whatever. I also want to extract the edge points (marked with blue circles) and put it in a cell or matrix to use it later.

In fact I have tried to write function but I could not execute it. So I hope that our teachers here help me.

Note: intersection points are pixels have more than two pixels in a neighborhood, while edge points have just one pixel.

Thank you

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Puja Das 2019-10-29

I want the code please send me puja250196@gmai.com

Image Analyst 2019-10-29

Puja: Did you scroll down to here? Source code is there. Why email it to you when you can get it right there?

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Answer 1

Image Analyst 2015-11-10

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链接

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https://ww2.mathworks.cn/matlabcentral/answers/253909-find-intersection-points-and-edge-points#answer_199278

在 MATLAB Online 中打开

This functionality is built into the bwmorph() function:

bpImage = bwmorph(binaryImage, 'Branchpoints');
epImage = bwmorph(binaryImage, 'Endpoints');
% Plot blue circles over branchpoints
[ybp, xbp] = find(bpImage);
hold on;
plot(xbp, ybp, 'bo', 'MarkerSize', 15);
% Plot red circles over endpoints.
[yep, xep] = find(epImage);
hold on;
plot(xbp, ybp, 'ro', 'MarkerSize', 15);

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swathi 2018-8-31

What modification should be brought in the given code, for image with white background & signature in black. Please help

swathi 2018-8-31

I mean, to obtain the end points of the signature, where in, image has white background & signature in black. Kindly help.

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Answer 2

Robert 2015-11-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/253909-find-intersection-points-and-edge-points#answer_199271

BinaryImageTry.m

Attached i send you a m.file. It finds the edge points right. For the intersection points, there is still some error, but the file can maybe help you as a draft.

Regards, Robert